LIST OF PLATES. 





I. 

 II. 



III. 



IV. 



V. 



VI. 



VII. 



VIII. 



IX. 



X. 



XI. 



XII. 



XIII. 

 XIV. 



XV. 



XVI. 



XVII. 



XVIII. 

 XIX. 



XX. 



XXI. 



Fort Union Mammals. See explanation, p. 25. 



Fort Union Mammals. See explanation, p. 25. 



Upper Devonian Brachiopoda. See explanation, p. 153. 



C/6'io//ijruh'Ha dgTom'ca Ra.ymond. See explanation, p. 153. 



Loxoptcria holzapfeli z.nA L. claj-kei. See explanation, p. 153. 



Upper Devonian Cephalopoda and Pelecypoda. See explana- 

 tion, p. 157. 



Upper Devonian Cephalopoda. See explanation, p. 157. 



Upper Devonian Cephalopoda. See explanation, p. 158. 



Skull of Procaincliis elrodi Douglass. 



Skull and Neck of Procamelus elrodi Douglass. 



Palatal view of Skull of Procamelus elrodi Douglass. 



Geological Section from Jack's Run to Wood's Run. See ex- 

 planation, p. 177. 



Unconformity near Wood's Run. See explanation, p. 177. 



Unconformity near Etna and Wood's Run. See explanation, p. 

 177. 



Upper Figure. An Ox-bow on the Little Missouri River. 

 "Logging Camp" H. T. Ranch. About Forty Miles 

 above Medora in North Dakota. Looking South. 



Lower Figure. H. T. Horse Ranch. In the Distance Hill 

 composed of Fort Union Beds. 



Upper Figure. Black Butte, Billings County, North Dakota. 

 Looking South. 



Lower Figure. White Butte, Billings County, North Dakota. 



Upper Figure. Part of Eastern Portion of White Butte. 



Lower Figiire. View Four Miles North of White Butte. 



Cliff Lake, Madison County, Montana. 



Terraces of the Tertiary and More Recent Deposits in the 



Upper Madison Valley in Montana. 

 Section from North to South through the Jurassic (?), Cretaceous, 

 and Tertiary Rocks on Fish Creek, Sweetgrass County, 

 Montana. 



Upper Figure. Part of the Eastern Portion of White Butte 



from the Eastern Side. 

 Lower Figure. Part of the Eastern Portion of White Butte. 



